Who do you move? A stochastic population model to guide translocation strategies for an endangered freshwater fish in south-eastern Australia

摘要: Abstract The number of threatened species continues to increase due a range anthropogenic disturbances, and many continue decline increasing their risk extinction. Translocation is widely used management technique establish new populations reduce the There are, however, issues be considered. For example, for some donor population may impacted by translocation, other it must decided whether translocate adults or juveniles populations. question then becomes who do you move? endangered Macquarie perch in south-eastern Australia continuing decline, with recent Millennium Drought (1997–2010) associated events (e.g., bushfires) contributing dramatic local declines need emergency responses. Successful historic translocations this involved adult fish, however removal significant numbers fish now impact source alternative translocation approaches needed investigating. use sub-adult juvenile that would expected experience higher mortality, an approach establishing which have less severe impacts on However, required, frequency likelihood establishment are unknown. This study outlines development model assist trialling scenarios perch. predicts young-of-year (age 0+) unlikely successful unless ∼600 females released annually five years. If translocating yearling 1+) annual >100 required achieve success, stocking at least consecutive years required. recruitment failure magnitude Allee effects increases, increased yearlings prolonged (10 years) success. addition small combination decreases increases chance success under more stressful scenarios.